There's substantial bi-directional traffic between the Catalan and Scottish independence movements.

Also, Manchester doesn't have its own language which the central government tried to suppress.

> This is not like England and Scotland, is more like Manchester wanting to leave England.

In what way?

(Let's ignore for now the fact Manchester did have a semi-serious independence movement during the Scotland referendum, and no police were necessary.)

Catalonia has it's own language though, whereas Mancunians may speak strangely, but it is still considered English.